)\6 Field, Forest, and Wayside Flowers 



courage these many flies, without deterring those 

 useful and desired visitors, the bees. Will flies 

 learn after a while to shun the milkweed's dan- 

 gerous sweets, so that they may all be left for 

 worthier and more welcome guests? And how 

 many generations will it take this proverbially 

 foolish insect to lay the lesson to heart? (Fig. 88). 



